Near-nozzle spray and spray collapse characteristics of spark-ignition direct-injection fuel injectors under sub-cooled and superheated conditions
Near-nozzle spray and spray collapse characteristics of spark-ignition direct-injection fuel injectors under sub-cooled and superheated conditions
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过冷和过热工况下火花点火直喷喷油器近喷嘴喷雾和喷雾塌陷特性
DOI：
10.1016/j.fuel.2016.06.080
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发表时间：
2016-11
期刊：
影响因子：
7.4
通讯作者：
Pan Hujie
中科院分区：
文献类型：
--
作者：
Wu Shengqi;Xu Min;Hung David L. S.;Li Tianyun;Pan Hujie
尽管闪速沸腾已被证明能产生更细的燃油喷雾，并大大改善燃油的蒸发质量，而且液体燃油从喷嘴排出后很快雾化，但有关喷雾塌陷过程和喷嘴出口临界位置附近闪速沸腾喷雾特性的文献却很有限。在这项研究中，近喷嘴燃料喷雾的各种类型的火花点火直喷原型多孔喷油器进行了研究，在很大范围的过冷和过热的条件下，使用高速背光成像技术。研究了燃油温度、环境压力、喷嘴长径比、喷嘴数等因素对喷雾特性的影响，以及过热工况下近喷嘴喷雾特性和喷雾塌陷现象。实验结果表明，提高燃料温度和降低环境压力都会导致燃料射流的快速分裂和由于闪急沸腾而产生的更宽的羽流。在过热条件下，喷嘴内燃油蒸发和喷嘴外燃油沸腾是控制闪急沸腾喷雾雾化的主要因素。喷雾塌陷长度随Pa/Ps比的减小而增大，随喷射时间的延长而增大。闪急沸腾喷雾还具有解决喷射器存款问题的潜力，显著改善了喷射结束性能。
There is limited literature available regarding the spray collapse process and the characteristics of flash boiling spray near the critical location of the nozzle exit, even though flash boiling has been proven to produce finer fuel spray with much improved vaporizing quality, and liquid fuel atomizes quickly soon after it is discharged from the nozzle. In this study, the near-nozzle fuel spray of various types of spark-ignition direct-injection prototype multi-hole injectors was investigated under a wide range of sub-cooled and superheated conditions using a high-speed backlit imaging technique. The effects of fuel temperature, ambient pressure, nozzle L/D ratio, and nozzle number, as well as near-nozzle spray characteristics and spray collapse phenomenon under superheated conditions, were studied. Experimental results revealed that both increasing fuel temperature and decreasing ambient pressure resulted in faster fuel jet disintegration and wider fuel plume due to flash boiling. In-nozzle fuel evaporation and outside-nozzle fuel boiling were the primary influences governing flash boiling spray atomization under superheated conditions. Spray collapse length increased with decreasing Pa/Ps ratio; it also increased with the elapse of injection time. Flash boiling spray also has the potential to resolve injector deposit issues with significantly improved end-of-injection performance.
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影响因子：
7.4
作者：
Aleiferis, P. G.;van Romunde, Z. R.
通讯作者：
van Romunde, Z. R.
DOI：
10.4271/2014-01-1438
发表时间：
2014-04
期刊：
--
影响因子：
--
作者：
H. Husted;T. D. Spegar;J. G. Spakowski
通讯作者：
H. Husted;T. D. Spegar;J. G. Spakowski
影响因子：
7.4
作者：
Joonsik Hwang;Youngsoo Park;C. Bae;Jin-wook Lee;Soon-Chan Pyo
通讯作者：
Joonsik Hwang;Youngsoo Park;C. Bae;Jin-wook Lee;Soon-Chan Pyo
DOI：
--
发表时间：
2008
期刊：
--
影响因子：
--
作者：
M. Mojtabi;N. Chadwick;G. Wigley;J. Hélie
通讯作者：
M. Mojtabi;N. Chadwick;G. Wigley;J. Hélie
影响因子：
7.4
作者：
Youngsoo Park;Joonsik Hwang;C. Bae;Ki‐Hyun Kim;Jin-wook Lee;Soon-Chan Pyo
通讯作者：
Youngsoo Park;Joonsik Hwang;C. Bae;Ki‐Hyun Kim;Jin-wook Lee;Soon-Chan Pyo